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MrHajiCoolBreez's avatar
MrHajiCoolBreez
Frequent Visitor
1 year ago
Solved

Getting the Previous Value in a Matrix with 7 rows

I have a Matrix which looks like this   I have 7 Columns in ROWS "EndOfSnapShotWeek" in the COLUMNS and "Rev1" and "Rev2" in the VALUES I want to create two measures that will calculate ...
  • lbendlin's avatar
    lbendlin
    1 year ago

    You have interesting data including negative numbers. Calculating a WoW with a mix of positive and negative numbers is extremely subjective.  Make sure you agree with the formula.

     

    Here's my (subjective) version:

     

     

    Rev1 change = 
var pr1 = CALCULATE(sum(test[Rev1]),DATEADD('Calendar'[Date],-7,DAY))
return divide(sum(test[Rev1])-pr1,abs(pr1),1)

     

     

     

    However your x axis is driven by a fact date (end of snapshot week) and not by the dimension date as it should be . You will want to correct that too ( or modify the above formula)

     

     

     

lbendlin's avatar
lbendlin
Icon for Super User rankSuper User
1 year ago

Short of materializing your result into a calculated table? Don't think so.  But worth a try.

 

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Please show the expected outcome based on the sample data you provided.

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MrHajiCoolBreez's avatar
MrHajiCoolBreez
Frequent Visitor
1 year ago

Here is a PBIX file with sample data
Sample PBIX 
I don't have super user access so I can't directly attached a PBIX so I'm using WeTrasfer

With regards to expected output, if you can create 2 measures that I can use in conditional formating that shows the difference between Rev1 and Rev2 with the previous week that would be ideal

  • lbendlin's avatar
    lbendlin
    Icon for Super User rankSuper User
    1 year ago

    You have interesting data including negative numbers. Calculating a WoW with a mix of positive and negative numbers is extremely subjective.  Make sure you agree with the formula.

     

    Here's my (subjective) version:

     

     

    Rev1 change = 
var pr1 = CALCULATE(sum(test[Rev1]),DATEADD('Calendar'[Date],-7,DAY))
return divide(sum(test[Rev1])-pr1,abs(pr1),1)

     

     

     

    However your x axis is driven by a fact date (end of snapshot week) and not by the dimension date as it should be . You will want to correct that too ( or modify the above formula)

     

     

     

    • MrHajiCoolBreez's avatar
      MrHajiCoolBreez
      Frequent Visitor
      1 year ago

      Thank you for this but the formula for `pr1` isn't quite right.
      My bad,  my explanation for expected output wasn't clear.

      As you will notice that not every change is being highlighted as red or green.
      For example, Rev1 on row 6 should be in green. Value went up from 30527.25 to 30346.50

      pr1 = 
var eosw = max(test[EndOfSnapshotWeek])
RETURN CALCULATE(
            sum(test[Rev1]),
            test[EndOfSnapshotWeek]=eosw-7
        )

      I require it to match this visual calculation

      vcPr1 = PREVIOUS([Rev1], 1, COLUMNS)

      As you can see they don't match

      My X axis is driven by the fact table because the active relationship between the fact table and the calendar table is on a different date column in the fact table.

      • lbendlin's avatar
        lbendlin
        Icon for Super User rankSuper User
        1 year ago

        As you can see in my example I included a neutral area of +/- 5%.  Feel free to modify that.